I used to use thepiratebay.org, but recently it seems the quality of the site has degraded.
I sometimes also use 1337xx.to , but that site seems to have a very small selection.
Note that I couldn’t find an answer to this question in the wiki + meathread, so if the answer is already there, please direct my attention to it 🙏🏴☠️
I like to use rutracker.org. The tracker is public but the search is behind a registration form. Based on my experience it has some content I was unable to find on English trackers. Additionally, InsaneZemRes (a no compression repacker, good if internet speed/bandwidth aren’t of a concern) uploads new releases to there instantly, so very comfortable if I’m looking for a game that came out recently.
In case I can’t find what I’m looking for on rutracker, torrentgalaxy.to is a good alternative. They have a lot of the RARBG torrents and I think that’s where most ex-RARBG users migrated.
Rutracker is great for CAD and other engineering software.
Apart from private trackers, rutracker seems to be the best for lossless movies in 1080p. Big selection of blueray remuxes/rips which are often missing from the other public indexers, likely because causal users prefer 2gb files to >20gb.